TWI404013B - Electronic device and method for adjusting pixel clock frequency thereof - Google Patents

Abstract

An electronic device and a method for adjusting a pixel clock frequency thereof are provided. The electronic device automatically detects whether or not the electronic device has a wireless communication module during a boot procedure. If the electronic device has the wireless communication module, the electronic device reads an adjustment parameter corresponding to a panel model of the electronic device through a lookup table stored in the electronic device and adjusts the pixel clock frequency according to the adjustment parameter so as to avoid generating harmonics of the panel pixel clock in an operating frequency band of the wireless communication module.

Description

Electronic device and method for adjusting its pixel clock frequency

The present invention relates to a method for adjusting the pixel frequency of a panel, and more particularly to a method and an electronic device for automatically adjusting a pixel clock frequency to avoid noise generation in a frequency band of a wireless communication module.

With the development of wireless network technology, electronic devices, such as notebook computers, mobile phones, etc., have become more and more popular with wireless communication modules. Therefore, the wireless network uses the use of radio waves to transmit data. Since it uses radio waves as the data transmission, the mobility of hardware erection or use is much more convenient than that of the wired network, and the user can be free from Space and location restrictions, wireless Internet access or data transmission.

Wireless networks are gradually evolving toward public wireless areas, and communication protocols for various wireless local area networks are booming. The standards for wireless communication technologies are usually developed by organizations engaged in specific industries, such as the agreements 802.11 and 802.16 set forth by the Institute of Electrical and Electronics Engineers (IEEE). IEEE 802.11 contains a set of standards developed by the IEEE 802.11 committee, which establishes standards related to wireless local area networks (WLANs). Part of the IEEE 802.11 family of standards defines a method of interoperability between a wireless receiver and a wireless transmitter.

At present, electronic devices can also wirelessly access the Internet through 3G (third generation) mobile communication technology provided by telecom operators. Currently, there are four standards for 3G: CDMA2000, WCDMA, TD-SCDMA, WiMAX, as long as 3G wireless modules are configured, electronic The device can be connected to the Internet via a base station. However, since the portable electronic products are currently developing in a short, light and thin manner, and the antenna of the wireless communication module is usually adjacent to the panel, the noise from the panel easily affects the receiving sensitivity of the wireless communication module and the system. efficacy. In particular, the high frequency harmonics of the pixel clock will generate noise in the operating frequency band of the wireless communication module, which affects the operational efficiency of the wireless communication module. In response to such problems, the current practice is to use different Extended Display Identification Data (EDID) to adjust the pixel clock of the panel in accordance with different panel models. However, this approach will result in the need to prepare multiple different EDIDs for the same panel model, which will result in inventory risks for EDID and will also increase manufacturing costs.

The invention provides an electronic device and a method for automatically adjusting a pixel clock frequency of a panel, and automatically detects whether an electronic device is equipped with a wireless communication module, and then finds a pixel clock suitable for the panel through a lookup table, thereby avoiding drawing The harmonics of the prime clock occur in the operating frequency band of the wireless communication module, thereby affecting the transceiver performance of the wireless communication module.

In view of the above, the present invention provides a method for adjusting the pixel clock frequency of a panel, which is applicable to an electronic device having a panel. The method includes the following steps: First, establishing a lookup in the electronic device The table then reads the internal data of the above panel to obtain a panel model and a pixel clock. Detecting whether the electronic device has a wireless communication module. If the electronic device has the wireless communication module, reading a parameter adjustment value corresponding to the panel model via the lookup table. Then, the frequency of the pixel clock transmitted to the above panel is adjusted according to the above parameter adjustment value.

In an embodiment of the invention, the lookup table includes a plurality of sets of panel models and a plurality of sets of parameter adjustment values having corresponding relationships. The above lookup table is stored in one of the host's output input system (BIOS) or a video basic output/input system (VBIOS). The electronic device further includes a display card, wherein the display card outputs the pixel clock to the panel, and adjusts the frequency of the pixel clock according to the parameter adjustment value.

In an embodiment of the invention, the wireless communication module includes a third generation mobile communication (3rd generation, 3G) module or a global interoperability for microwave access (WiMAX) module.

In an embodiment of the invention, the internal data is Extended Display Identification Data (EDID). If the electronic device does not have the wireless communication module, the frequency of the pixel clock is determined according to the EDID of the panel.

Viewed from another perspective, the present invention provides an electronic device including a panel and a host. The panel has an internal data, and the host is coupled to the panel and has a lookup table. The host reads the internal data of the panel to obtain a panel model and a pixel clock and detects whether the electronic device has a wireless communication module, if the electronic device has the wireless In the communication module, the host reads a parameter adjustment value corresponding to the panel model via the lookup table, and adjusts a frequency of a pixel clock transmitted to the panel according to the parameter adjustment value.

Based on the above, the present invention sets a lookup table in the electronic device, which stores the correspondence between the panel model and the suitable pixel clock. The electronic device can automatically set the frequency of the pixel clock when the power is turned on, thereby avoiding the pixel clock. The communication frequency band of the wireless communication module causes noise. Since the lookup table is stored in the host, the internal data can be changed at any time, so the EDID of the panel end does not need to be adjusted, and the electronic device can automatically set the frequency of the pixel clock through the lookup table according to different panel models to prevent miscellaneous The generation of information is quite convenient for system design.

The above described features and advantages of the present invention will be more apparent from the following description.

First embodiment

1 is an electronic device according to a first embodiment of the present invention. The electronic device 100 includes a host 110 and a panel 120. The panel 120 is coupled to the host 110. The host 110 includes a display card 112 and a wireless communication module 114. And Basic Input/Output System (BIOS) 116. The basic input/output system 116 has a lookup table 115. The lookup table 115 stores a plurality of sets of panel models and parameter setting values corresponding to the pixel clocks. Each panel type corresponds to a parameter setting value, and the parameters thereof. The set value can be used to set the frequency of the pixel clock, and the user can modify the data at any time according to the needs. The pixel clock refers to a clock signal transmitted from the host 110 or the display card 112 to the panel 120, which can serve as a reference clock for the panel 120 during operation.

When the electronic device 100 is powered on, the host 110 reads the internal data in the panel 120 (for example, Extended Display Identification Data (EDID)) to learn the panel model, specifications, and setting values of the panel 120, and the EDID. Generally, the electronically erasable and programmable read only memory (EEPROM) is stored, but the embodiment is not limited. In addition, during the boot process, the host 110 detects whether the system is in the system. The wireless communication module 114 is provided. When the system has the wireless communication module 114, the host 110 obtains the corresponding parameter adjustment value from the lookup table 115 according to the panel model to replace the pixel in the read EDID. The frequency of the pulse. The display card 112 in the host 110 adjusts the frequency of the pixel clock output to the panel 120 according to the parameter adjustment value in the lookup table 115. Thereby, the pixel clock is avoided in the wireless communication module 114. Harmonics or noise are generated in the frequency band to affect the performance of the wireless communication module 114.

When the wireless communication module 114 is not provided in the host 110, the host 110 directly drives the panel 120 according to the read EDID, and the frequency of the pixel clock is set according to the EDID of the panel 120, and will not be changed. . The above-mentioned wireless communication module 114 refers to a wireless transmission device, such as a wireless network card, a third generation mobile communication (3rd Generation, 3G) module, or a Worldwide Interoperability for Microwave Access (WiMAX) module. The working frequency band is, for example, 869 MHz to 894 MHz, 925 MHz to 960 MHz, 1805 MHz to 1880 MHz, 1930 MHz to 1990 MHz, and 2110 MHz to 2170 MHz, but the embodiment is not limited.

In addition, it is worth noting that the lookup table 115 can also be stored in the video graphics Array BIOS (VGA BIOS) in the display card 114. This embodiment does not limit the storage location of the lookup table 115, as long as The host 110 can read the data in the lookup table 115 when it is powered on. In addition, whether the wireless communication module 114 and the setting parameters of the pixel clock are set in the detection system can be directly executed by the basic input/output system 116 or by using the remaining embedded chips in the system. The example is not limited.

Next, an example of a lookup table is used to describe the lookup table 115 of the present embodiment, but the embodiment is not limited to the table 1. Referring to the following Table 1, the table 1 is a search according to the first embodiment of the present invention. Table 115.

Table 1 above includes parameter setting values (ie, frequencies) of different panel models, resolutions, and pixel clocks corresponding to different manufacturers. It is worth noting that the above table 1 also includes different wireless communication modules, and each type of panel can also set different pixel clock frequencies when paired with different wireless communication modules. The frequency of the pixel clock can be obtained by calculating the working frequency band of the wireless communication module and the frequency of the pixel clock, or directly obtaining the optimal parameter setting value through experiments. In the present embodiment, the numerical values in the above Table 1 and the format setting thereof are merely examples, and the embodiment is not limited thereto. Table 1 above can add new parameter values and specifications according to design requirements, and different correspondences, so that the lookup table 115 can be applied to electronic devices and panel models of different specifications and models. In this embodiment, the electronic device is, for example, a notebook computer and a mobile phone, but the embodiment is not limited.

Since the data in the lookup table 115 can be modified or added at any time, it can be applied to different types of electronic products. When the panel 120 adopts different models, the host 110 can also find corresponding parameter setting values to set the pixel clock. Frequency of. Therefore, it is not necessary to increase the EDID of different models according to the type of the electronic product, and the host 110 can adjust the appropriate parameter values to drive the panel 120, thereby avoiding the inventory problem of the EDID. In addition, it should be noted that the technical means of this embodiment can also be used to adjust different EDID parameter values, and the embodiment is not limited to the pixel clock.

Second embodiment

From another point of view, the above embodiment can be summarized as a method for adjusting the clock frequency of the panel pixel. Please refer to FIG. 2 , which is a method for adjusting the pixel clock frequency of the panel according to the second embodiment of the present invention. Flowchart, the method is applicable to an electronic device having a panel, and the method includes the following steps. First, a lookup table is established in the electronic device (step S210). The lookup table has a plurality of sets of panel models and a plurality of sets of parameter adjustment values corresponding to each other. The parameter adjustment value can be used to adjust the frequency of the pixel clock output to the panel. Then, the internal data of the panel (i.e., extended display identification data (EDID)) is read to obtain the parameter values of the panel model and the pixel clock (step S220). Next, detecting whether the electronic device has a wireless communication module (S230), and if so, reading a parameter adjustment value corresponding to one of the panel models via a lookup table (step S240), and then adjusting and transmitting the parameter to the panel according to the parameter adjustment value. The frequency of the pixel clock (step S250). If the electronic device does not have a wireless communication module, the electronic device is powered on according to the normal booting procedure (step S260), and the panel is driven using the EDID read from the panel.

The electronic device can detect whether the wireless communication module and the panel model used are set by itself, and then obtain the appropriate parameter values in the lookup table to adjust the frequency of the pixel clock to prevent the pixel clock from affecting the wireless communication module. Receive sensitivity. The look-up table can be updated at any time according to the design requirements, and new parameter values can be added. With the technical means, the electronic device can automatically adjust the EDID parameter with different models to improve the performance of the electronic device without hardware adjustment. For the remaining details of the method of this embodiment, please refer to the above first embodiment, which is not described here.

In summary, the present invention uses a lookup table to store parameter values of various panel models and their corresponding pixel clocks, so that the electronic device can set the frequency of the pixel clock when the device is turned on, thereby avoiding the pixel clock in the wireless communication. The operating frequency band of the module generates harmonics or noise and affects the sensitivity and performance of the wireless communication module. Since the lookup table can be updated at any time, the technical means of the present invention can be applied to different types of electronic products without considering whether the set value of the EDID in the panel is appropriate, and the electronic device can automatically set the required parameter values and simplify Design the process to make the design more efficient.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Electronic devices

110‧‧‧Host

120‧‧‧ panel

112‧‧‧ display card

114‧‧‧Wireless communication module

115‧‧‧ lookup table

S210~S260‧‧‧ Flowchart steps

1 is an electronic device in accordance with a first embodiment of the present invention.

2 is a flow chart of a method of adjusting a pixel clock frequency of a panel in accordance with a second embodiment of the present invention.

S210~S260. . . Flow chart step

Claims (15)

A method for adjusting a pixel clock frequency is applicable to an electronic device having a panel, the method comprising: establishing a lookup table in the electronic device; reading an internal data of the panel to obtain a panel model Detecting whether the electronic device has a wireless communication module; if the electronic device has the wireless communication module, reading a parameter adjustment value corresponding to the panel model via the lookup table; The frequency of the pixel clock transmitted to the panel is adjusted according to the parameter adjustment value. The method for adjusting a pixel clock frequency according to claim 1, wherein the lookup table includes a plurality of sets of panel models and a plurality of sets of parameter adjustment values having corresponding relationships. The method for adjusting a pixel clock frequency according to claim 1, wherein the electronic device comprises a display card, the display card outputs the pixel clock to the panel, and adjusts the picture according to the parameter adjustment value. The frequency of the prime clock. The method for adjusting a pixel clock frequency according to the first aspect of the patent application, wherein the wireless communication module comprises a third generation mobile communication (3rd Generation, 3G) module or a global interoperability for Microwave Access, referred to as WiMAX module. The method for adjusting a pixel clock frequency according to the first aspect of the patent application, wherein the internal data is an Extended Display Identification Data (EDID). The method for adjusting a pixel clock frequency according to claim 5, wherein if the electronic device does not have the wireless communication module, determining a frequency of the pixel clock according to the internal data. The method for adjusting a pixel clock frequency according to the first aspect of the patent application, wherein the lookup table is stored in an output input system (Basic Input/Output System, BIOS for short) or a video basic output/input of the host. In the system (Video Graphics Array BIOS, VBIOS for short). An electronic device comprising: a panel having an internal data, the internal data including at least a panel model and a pixel clock; and a host coupled to the panel and having a lookup table; wherein, when the host is powered on The host reads the internal data of the panel to obtain the panel model and the pixel clock and detects whether the electronic device has a wireless communication module. If the electronic device has the wireless communication module, the host The host reads a parameter adjustment value corresponding to the panel model via the lookup table and adjusts the frequency of the pixel clock transmitted to the panel according to the parameter adjustment value. The electronic device of claim 8, wherein the lookup table comprises a plurality of sets of panel models and a plurality of sets of parameter adjustment values having corresponding relationships. The electronic device of claim 8, wherein the electronic device further comprises a display card, the display card outputs the pixel clock to the panel, and adjusts the frequency of the pixel clock according to the parameter adjustment value. . The electronic device of claim 8, wherein the wireless communication module comprises a 3rd Generation (3G) module or a Worldwide Interoperability for Microwave Access (WiMAX). Module. The electronic device of claim 8, wherein the internal data is an Extended Display Identification Data (EDID). The electronic device of claim 12, wherein if the electronic device does not have the wireless communication module, the host determines the frequency of the pixel clock according to the internal data of the panel. The electronic device of claim 8, wherein the main body comprises an output input system for storing the lookup table. The electronic device of claim 8, wherein the host comprises a video basic output/input system for storing the lookup table.